1 | /* Copyright (C) 2006-2018 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2006. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <signal.h> |
21 | #include <time.h> |
22 | #include <sys/poll.h> |
23 | #include <kernel-features.h> |
24 | #include <sysdep-cancel.h> |
25 | |
26 | |
27 | #ifdef __NR_pselect6 |
28 | # ifndef __ASSUME_PSELECT |
29 | static int __generic_pselect (int nfds, fd_set *readfds, fd_set *writefds, |
30 | fd_set *exceptfds, |
31 | const struct timespec *timeout, |
32 | const sigset_t *sigmask); |
33 | # endif |
34 | |
35 | |
36 | int |
37 | __pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, |
38 | const struct timespec *timeout, const sigset_t *sigmask) |
39 | { |
40 | /* The Linux kernel can in some situations update the timeout value. |
41 | We do not want that so use a local variable. */ |
42 | struct timespec tval; |
43 | if (timeout != NULL) |
44 | { |
45 | tval = *timeout; |
46 | timeout = &tval; |
47 | } |
48 | |
49 | /* Note: the system call expects 7 values but on most architectures |
50 | we can only pass in 6 directly. If there is an architecture with |
51 | support for more parameters a new version of this file needs to |
52 | be created. */ |
53 | struct |
54 | { |
55 | __syscall_ulong_t ss; |
56 | __syscall_ulong_t ss_len; |
57 | } data; |
58 | |
59 | data.ss = (__syscall_ulong_t) (uintptr_t) sigmask; |
60 | data.ss_len = _NSIG / 8; |
61 | |
62 | int result; |
63 | |
64 | #ifndef CALL_PSELECT6 |
65 | # define CALL_PSELECT6(nfds, readfds, writefds, exceptfds, timeout, data) \ |
66 | SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds, timeout, data) |
67 | #endif |
68 | |
69 | result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout, |
70 | &data); |
71 | |
72 | # ifndef __ASSUME_PSELECT |
73 | if (result == -1 && errno == ENOSYS) |
74 | result = __generic_pselect (nfds, readfds, writefds, exceptfds, timeout, |
75 | sigmask); |
76 | # endif |
77 | |
78 | return result; |
79 | } |
80 | weak_alias (__pselect, pselect) |
81 | |
82 | # ifndef __ASSUME_PSELECT |
83 | # define __pselect static __generic_pselect |
84 | # endif |
85 | #endif |
86 | |
87 | #ifndef __ASSUME_PSELECT |
88 | # include <misc/pselect.c> |
89 | #endif |
90 | |